Pressure oxidation of double refractory raw materials in the presence of limestone

Zaytsev, P. V.; Fomenko, I. V.; Chugaev, L. V.; Shneerson, Ya. M.

doi:10.17580/tsm.2015.08.05

Cited by 8 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of the possible methods of hydrometallurgical processing of refractory sulfide raw materials is the use of HNO 3 to oxidize the materials without the use of high pressure or fine grinding [28][29][30][31], as nitric acid is one of the most effective oxidizing and leaching agents [32,33].…”

Section: Of 15mentioning

confidence: 99%

Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid

Rogozhnikov

Shoppert

Dizer

et al. 2019

Metals

View full text Add to dashboard Cite

The processing of refractory gold-containing concentrates by hydrometallurgical methods is becoming increasingly important due to the depletion of rich and easily extracted mineral resources, as well as due to the need to reduce harmful emissions from metallurgy, especially given the high content of arsenic in the ores. This paper describes the investigation of the kinetics of HNO3 leaching of sulfide gold-containing concentrates of the Yenisei ridge (Yakutia, Russia). The effect of temperature (70–85 °C), the initial concentration of HNO3 (10–40%) and the content of sulfur in the concentrate (8.22–22.44%) on the iron recovery into the solution was studied. It has been shown that increasing the content of S in the concentrate from 8.22 to 22.44% leads to an average of 45% increase in the iron recovery across the entire range temperatures and concentrations of HNO3 per one hour of leaching. The leaching kinetics of the studied types of concentrates correlates well with the new shrinking core model, which indicates that the reaction is regulated by interfacial diffusion and diffusion through the product layer. Elemental S is found on the surface of the solid leach residue, as confirmed by XRD and SEM/EDS analysis. The apparent activation energy is 60.276 kJ/mol. The semi-empirical expression describing the reaction rate under the studied conditions can be written as follows: 1/3ln(1 − X) + [(1 − X)−1/3 − 1] = 87.811(HNO3)0.837(S)2.948e−60276/RT·t.

show abstract

Section: Of 15mentioning

confidence: 99%

Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid

Rogozhnikov

Shoppert

Dizer

et al. 2019

Metals

View full text Add to dashboard Cite

show abstract

“…However, it should be noted that the current results obtained from the alkaline method cannot be directly applied to the processing of refractory gold-containing raw materials, where gold is closely associated with sulfide minerals. In practice, various technologies are employed for the sulfide matrix recovery, including oxidative roasting, ultra-fine grinding, pressure oxidation (POX), bioleaching (BIOX), nitric acid oxidation, and others [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Development of a Two-Stage Hydrometallurgical Process for Gold–Antimony Concentrate Treatment from the Olimpiadinskoe Deposit

Rusalev¹,

Rogozhnikov

Dizer

et al. 2023

Materials

View full text Add to dashboard Cite

An integrated two-stage metallurgical process has been developed to process concentrates from the Olimpiadinskoe deposit, which contain high levels of antimony and arsenic. The optimal parameters for the alkaline sulfide leaching process of the initial concentrate from the Olimpiadinskoe deposit were determined to achieve the maximum extraction of antimony at a 99% level. The recommended parameters include an L:S ratio of 4.5:1, a sodium sulfide concentration of 61 g/L, a sodium hydroxide concentration of 16.5 g/L, a duration of 3 h, and a temperature of 50 °C. A synergistic effect of co-processing alkaline sulfide leach cakes with sulfuric and nitric acids was observed. The pre-treatment step reduced the nitric acid composition by converting carbonates into gypsum and increased the arsenic extraction by 15% during subsequent nitric acid leaching. The laboratory research on the nitric acid leaching of decarbonized cake established the key parameters for the maximum iron and arsenic extraction in solution (92% and 98%, respectively), including an L:S ratio of 9:1, a nitric acid concentration of 6 mol/L, and a time of 90 min. Full polynomial equations for the iron and arsenic extraction from the decarbonized cake were derived. The model demonstrated a high relevance, as evidenced by the determination coefficients (R2) of 96.7% for iron and 93.2% for arsenic. The technology also achieved a high gold recovery rate of 95% from the two-stage alkaline sulfide and nitric acid leach cake. Furthermore, the maximum deposition of arsenic from the nitrate leach solution in the form of insoluble As2S3 was determined to be 99.9%. A basic technological flow sheet diagram for processing the flotation gold–antimony concentrate from the Olimpiadinskoe deposit was developed, including two stages: the production of metallic antimony and the gold extraction from the nitric leach cake.

show abstract

“…However, it should be noted that the current results obtained from the alkaline method cannot be directly applied to the processing of refractory goldcontaining raw materials, where gold is closely associated with sulfide minerals. In practice, various technologies are employed for the sulfide matrix recovery, including oxidative roasting, ultra-fine grinding, pressure oxidation (POX), bioleaching (BIOX), nitric acid oxidation, and others [12,13].…”

Section: Introductionmentioning

confidence: 99%

Development of a Two- Stage Hydrometallurgical Technology for Processing Gold-Antimony Concentrate from the Olimpiadinskoe Deposit

Rusalev¹,

Rogozhnikov²,

Dizer³

et al. 2023

Preprint

View full text Add to dashboard Cite

An integrated two-stage metallurgical technology has been developed for processing concentrates from the Olimpiadinskoe deposit with high antimony and arsenic content. The parameters of the alkaline sulphide leaching process of the initial concentrate of the Olimpiadinskoe deposit, providing maximum extraction of antimony in solution at 99% level have been recommended. The L:S ratio = 4,5:1; the concentration of sodium sulphide - 61 g/L; the concentration of sodium-hydroxide – 6,5 g/L; the duration – 3 hours; the temperature – 50 °C. A synergistic effect of alkaline sulphide leach cakes co-processing by sulphuric and nitric acids has been determined. Pre-treatment allows to reduce the composition of nitric acid by converting the carbonates into gypsum and increases the extraction of arsenic by 15 % at the following nitric leaching. Laboratory research of nitric acid leaching of decarbonized cake allowed to set the basic parameters for maximum iron and arsenic extraction in solution (92 and 98 %): the L:S ratio =9:1; the concentration of nitric acid – 6 mol/L; the time – 90 min. The full polynomial equations for iron and arsenic extraction from decarbonised cake have been derived. The model is relevant since the value the determination coefficients for iron and arsenic R2 were 96,7 and 93,2 %. The high value of gold recovery from the cake of two-stage alkaline sulphide and nitric acid leach cake at 95 % has been established. The maximum value of arsenic deposition from the nitrate leach solution in the form of the insoluble deposition As2S3 99,9 %. A basic technological flowsheet diagram for flotation gold-antimony processing for the Olimpiadinskoe deposit has been developed; it includes two redistributions: production of metallic antimony and gold extraction from the nitric leach cake.

show abstract

Pressure oxidation of double refractory raw materials in the presence of limestone

Cited by 8 publications

References 0 publications

Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid

Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid

Development of a Two-Stage Hydrometallurgical Process for Gold–Antimony Concentrate Treatment from the Olimpiadinskoe Deposit

Development of a Two- Stage Hydrometallurgical Technology for Processing Gold-Antimony Concentrate from the Olimpiadinskoe Deposit

Contact Info

Product

Resources

About